PRIMARY SKULL OSTEOSARCOMA, 2 CASES REPOR T

Primary tumors of the skull are rare and are estimated approximately i n about 2.4% of all bone primary tumors. Primary craniofacial osteosar coma accounts for 2 to 9% of cases in published series. The pure crani al location are estimated in the range of 0.7 to 3%. Spreading lesions to the central nervous system is uncommon, in addition plain film fea tures are misleading due to the lock of evidence of osseous involvemen t of the calvaria. CT scan is more sensitive to demonstrate bone lesio n as well as brain extension. MRI depict the soft tissue components ev en more clearly. We report two cases of skull osteosarcoma in two fema le patients without any preexistent affection. The particularity of th ese observations is that the intracranial extension presented as the b rain tumor.